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The National Industrial Security Program Operating Manual (NISPOM) is the Department of Defense's instruction to contractors of how to protect classified information. This printing of the NISPOM includes the latest from the Defense Security Services to include an Index and Industrial Security Letters. The NISPOM addresses a cleared contractor's responsibilities including: Security Clearances, Required Training and Briefings, Classification and Markings, Safeguarding Classified Information, Visits and Meetings, Subcontracting, Information System Security, Special Requirements, International Security Requirements and much more. It's not just for the FSO. Every Cleared employee should have a copy.